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15 cards from this deck
Equal distances in equal time intervals along a straight line
Velocity is vector (has direction); speed is scalar
50 Hz (50 dots per second)
t=n50t = \frac{n}{50}t=50n where nnn is number of spaces
v=stv = \frac{s}{t}v=ts where sss is distance, ttt is time
To compensate for/overcome friction
Evenly spaced dots throughout motion
Count spaces between dots, not the dots themselves
Virtually eliminates friction (frictionless motion)
Perfectly horizontal (level), checked with spirit level
Measures transit time of card/rider passing through
v=ltv = \frac{l}{t}v=tl where lll is card length, ttt is time
Keep eye directly above measurement point
1/50th of a second (0.02 s)
Multiple measurements show consistent velocity readings
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